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The composition of hydrogenated fats by high‐resolution 13 C nuclear magnetic resonance spectroscopy
Author(s) -
Gunstone Frank D.
Publication year - 1993
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02543022
Subject(s) - cis–trans isomerism , chemistry , resolution (logic) , resonance (particle physics) , fractionation , spectral line , double bond , spectroscopy , nuclear magnetic resonance spectroscopy , composition (language) , allylic rearrangement , proton magnetic resonance , carbon fibers , high resolution , analytical chemistry (journal) , nuclear magnetic resonance , stereochemistry , organic chemistry , materials science , physics , atomic physics , linguistics , philosophy , quantum mechanics , astronomy , artificial intelligence , composite number , computer science , composite material , catalysis , remote sensing , geology
The high‐resolution 13 C nuclear magnetic resonance spectra of twelve hydrogenated fats have been examined. Each spectrum contains 50–100 signals and reveals much about the nature of the acyl chains of both double‐bond position and configuration. The signals for the ω1, ω2 and ω3 carbon atoms give information on the cis and trans isomers of the Δ15, Δ14, Δ13 and Δ12 18:1 esters, respectively. Allylic signals distinguish between cis and trans esters, and the proportion of total cis to total trans isomers can be obtained from these. Olefinic signals are the most informative, and most of these have been assigned. This leads to a semi‐quantitative estimate of the various 18:1 isomers present. Assignments are based mainly on information already in the literature, but some were confirmed after urea fractionation of the acids from a hydrogenated oil in which cis and trans monoene acids were separately concentrated.